feat: add terminal font size zoom with Cmd+/- shortcuts

.gitignore

@@ -31,3 +31,4 @@ coverage/
 # Temporary files
 *.tmp
 .cache/
+.worktrees

frontend/src/App.tsx

@@ -19,6 +19,8 @@ import { agentStatusManager } from './services/AgentStatusManager';
 import { hookService } from './services/HookService';
 // Eagerly initialize so custom language detection is ready before any file opens
 import './services/CustomLanguageManager';
+// Register terminal font size zoom shortcuts (Cmd+/-)
+import './services/TerminalFontSize';
 
 import { useClipboardFix } from './hooks/useClipboardFix';
 import { useGlobalContextMenuFix } from './hooks/useGlobalContextMenuFix';

frontend/src/hooks/useCodeReviewTerminal.ts

@@ -10,6 +10,7 @@ import { Terminal } from '@xterm/xterm';
 import { FitAddon } from '@xterm/addon-fit';
 import { loadAddons } from '../lib/terminal-utils';
 import { spawn, type PtyHandle } from '../services/PortablePty';
+import { getTerminalFontSize, terminalFontSize } from '../services/TerminalFontSize';
 import { getAgentSettings, getDefaultAgent } from '../lib/settings-api';
 
 export interface CodeReviewTerminalOptions {
@@ -55,7 +56,7 @@ export function useCodeReviewTerminal(
         foreground: '#e6e6e6',
       },
       fontFamily: 'Menlo, Monaco, "Courier New", monospace',
-      fontSize: 13,
+      fontSize: getTerminalFontSize(),
       cursorBlink: true,
       allowProposedApi: true, // Required for Unicode11 addon
     });
@@ -140,6 +141,18 @@ export function useCodeReviewTerminal(
     }
   }
 
+  // React to global font size changes
+  createEffect(() => {
+    const size = terminalFontSize();
+    if (terminal) {
+      terminal.options.fontSize = size;
+      fitAddon?.fit();
+      if (pty && terminal.cols > 0 && terminal.rows > 0) {
+        pty.resize(terminal.cols, terminal.rows).catch(() => {});
+      }
+    }
+  });
+
   const fitTerminal = () => {
     fitAddon?.fit();
   };

frontend/src/services/TerminalFontSize.ts

@@ -0,0 +1,116 @@
+/**
+ * TerminalFontSize - Global terminal font size with Cmd+/- zoom support
+ *
+ * Persists the font size in localStorage and updates all active terminals.
+ */
+
+import { createSignal } from 'solid-js';
+import { terminalPool } from './TerminalPool';
+import { keyboardShortcutManager } from './KeyboardShortcutManager';
+
+const STORAGE_KEY = 'codelane-terminal-font-size';
+const DEFAULT_FONT_SIZE = 13;
+const MIN_FONT_SIZE = 8;
+const MAX_FONT_SIZE = 32;
+const STEP = 1;
+
+function loadFontSize(): number {
+  try {
+    const stored = localStorage.getItem(STORAGE_KEY);
+    if (stored) {
+      const parsed = parseInt(stored, 10);
+      if (!isNaN(parsed) && parsed >= MIN_FONT_SIZE && parsed <= MAX_FONT_SIZE) {
+        return parsed;
+      }
+    }
+  } catch {
+    // localStorage unavailable
+  }
+  return DEFAULT_FONT_SIZE;
+}
+
+function saveFontSize(size: number): void {
+  try {
+    localStorage.setItem(STORAGE_KEY, String(size));
+  } catch {
+    // localStorage unavailable
+  }
+}
+
+const [fontSize, setFontSizeSignal] = createSignal(loadFontSize());
+
+function applyToAllTerminals(size: number): void {
+  for (const handle of terminalPool.getAllHandles()) {
+    handle.terminal.options.fontSize = size;
+    try {
+      handle.fitAddon.fit();
+      // Resize PTY to match new cols/rows after font size change
+      terminalPool.resize(handle.id, handle.terminal.cols, handle.terminal.rows).catch(() => {});
+    } catch {
+      // terminal may not be attached yet
+    }
+  }
+}
+
+export function getTerminalFontSize(): number {
+  return fontSize();
+}
+
+/** Reactive signal accessor for use in SolidJS effects */
+export const terminalFontSize = fontSize;
+
+export function setTerminalFontSize(size: number): void {
+  const clamped = Math.max(MIN_FONT_SIZE, Math.min(MAX_FONT_SIZE, size));
+  setFontSizeSignal(clamped);
+  saveFontSize(clamped);
+  applyToAllTerminals(clamped);
+}
+
+export function increaseTerminalFontSize(): void {
+  setTerminalFontSize(fontSize() + STEP);
+}
+
+export function decreaseTerminalFontSize(): void {
+  setTerminalFontSize(fontSize() - STEP);
+}
+
+export function resetTerminalFontSize(): void {
+  setTerminalFontSize(DEFAULT_FONT_SIZE);
+}
+
+// Register global keyboard shortcuts for terminal zoom
+keyboardShortcutManager.register({
+  id: 'terminalZoomIn',
+  description: 'Increase terminal font size',
+  key: '=',
+  modifiers: { cmdOrCtrl: true },
+  handler: () => increaseTerminalFontSize(),
+  scope: 'global',
+});
+
+keyboardShortcutManager.register({
+  id: 'terminalZoomInPlus',
+  description: 'Increase terminal font size (+)',
+  key: '+',
+  modifiers: { cmdOrCtrl: true },
+  handler: () => increaseTerminalFontSize(),
+  scope: 'global',
+});
+
+keyboardShortcutManager.register({
+  id: 'terminalZoomOut',
+  description: 'Decrease terminal font size',
+  key: '-',
+  modifiers: { cmdOrCtrl: true },
+  handler: () => decreaseTerminalFontSize(),
+  scope: 'global',
+});
+
+keyboardShortcutManager.register({
+  id: 'terminalZoomReset',
+  description: 'Reset terminal font size',
+  key: '0',
+  modifiers: { cmdOrCtrl: true },
+  handler: () => resetTerminalFontSize(),
+  scope: 'global',
+});

frontend/src/services/TerminalPool.ts

@@ -11,6 +11,7 @@
 import { spawn, type PtyHandle } from './PortablePty';
 import { getLaneAgentConfig, checkCommandExists } from '../lib/settings-api';
 import { createTerminal, createFitAddon, attachKeyHandlers, isTerminalViewportAtBottom } from '../lib/terminal-utils';
+import { getTerminalFontSize } from './TerminalFontSize';
 import { agentStatusManager } from './AgentStatusManager';
 import type { DetectableAgentType } from '../types/agentStatus';
 import type {
@@ -127,7 +128,7 @@ class TerminalPool {
    */
   private async createTerminalHandle(config: TerminalConfig): Promise<TerminalHandle> {
     // Create xterm.js instance with shared configuration
-    const terminal = createTerminal();
+    const terminal = createTerminal(undefined, getTerminalFontSize());
     const fitAddon = createFitAddon(terminal);
 
     let status: TerminalStatus = 'initializing';

packages/shared/src/terminal/terminal-utils.ts

@@ -91,12 +91,12 @@ export function isTerminalViewportAtBottom(
 /**
  * Creates a pre-configured xterm.js Terminal instance with current theme
  */
-export function createTerminal(theme: any): Terminal {
+export function createTerminal(theme?: any, fontSize: number = 13): Terminal {
   return new Terminal({
     cursorBlink: false,
     cursorStyle: 'block',
     fontFamily: 'Menlo, Monaco, "Courier New", monospace',
-    fontSize: 13,
+    fontSize,
     lineHeight: 1.4,
     allowProposedApi: true, // Required for Unicode11 addon
     allowTransparency: false,
@@ -212,6 +212,11 @@ export function attachKeyHandlers(
       return false;
     }
 
+    // Cmd/Ctrl+= / Cmd/Ctrl+- / Cmd/Ctrl+0: terminal zoom (handled by KeyboardShortcutManager)
+    if (isMod && (event.key === '=' || event.key === '+' || event.key === '-' || event.key === '0')) {
+      return false;
+    }
+
     // Shift+Enter: Claude Code compatibility
     if (event.key === 'Enter' && event.shiftKey) {
       sendShiftEnter();